M&S says

For smart sophistication and glamorous style, our long sleeve maxi dress has you covered. With chic long sleeves, cute buttons and a flowing skirt with a split, this shirt maxi dress pairs equally well with heels and flats depending on the occasion.

Care and Composition

35 days to return
You may return unused products within 35 days of purchase with a valid parcel summary document. Your items don't need to be in the original box or bag as long as they're securely packaged.

How to return
Simply use our returns portal to print a returns label and returns note. You will then be able to return all or part of your order at your own cost through your preferred carrier. To create a returns label, visit our returns portal select this option and follow the instructions.